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In addition to solving the port problem of A, the serial number problem also needs to be paid attention to. The serial number corresponds to the sliding window. The fake TCP packet needs to be filled with the serial number. If the value of the serial number is not in the sliding window of B when it is sent to B before A, B will actively discard it. So we need to find the serial number that can fall into the sliding window between AB at that time. This can be solved violently, because the length of a sequence is 32 bits, and the value range is 0-4294967296. If the window size is like 65535 under Windows I caught in the above figure, I only need to divide, and I know that at most I only need to send 65537 (4294967296/65535=65537) packets to have a sequence number fall into the sliding window. The desired value can be calculated quickly by exhaustion on multiple control hosts.大苞谷顿时瞪大眼睛，急忙将盒子盖上，又紧张地转头对外扫了一眼，才回头低声道：你胆子也太大了。马厩建在一个山坡上，这里有个大院子，专拨了两房家仆在此照管，一应设施包括吃喝等物事都是齐全的。解开谜团的过程颇有吸引力。此剧还重建死者被害时的现场，拍摄子弹如何在体内穿梭，血管、器官被破坏过程，逼真景观令人屏息。看了如此细致的破案手法，即使有犯罪的胆在以身试法时也要好好考虑。The content of the website is stored on the source server, and the CDN is the cache of the content. Users are only allowed to access the CDN. If the content is not on the CDN, the CDN sends a request to the source server. In this way, as long as the CDN is large enough, it can resist great attacks. However, this method has a premise that most of the content of the website must be statically cached. For websites (such as forums) with dynamic content as the main content, we must think of other ways to minimize users' requests for dynamic data.小葱张张嘴，却不知如何说起，隐约一点猜测，让她觉得胸口闭闷难受。